10. It is next contended by the learned Standing Counsel for the Corporation that the very appointment of the petitioner was in the reserved category as a Scheduled Tribe candidate. There is no dispute that the petitioner was selected initially as a Scheduled Tribe candidate. However, it cannot be claimed by the respondents-Corporation that the petitioner deliberately produced an invalid Community Certificate claiming Schedule Tribe category. There is no doubt that the Certificates dated 14-6-1976 issued by the Deputy Tahsildar, Mangalagiri and 25-02-1977 issued by the Tahsildar, Guntur are true. It also is true that G.O.Ms.No.1793, Education, dated 29-9-1970 placed Vaddera Community in Backward Classes Group-A category in the State of Andhra Pradesh. However, either Vaddera Community was in the category of Scheduled Tribes by the date the petitioner started studying or the Revenue Officials themselves were not aware that Vaddera Community was not a Scheduled Tribe